High-yield pulps form wheat straw and from poplar wood were treated with manganese -peroxidase (MnP) or with laccase (Lac) or with lacase (Lac) ,before and after a second refinign stage.Ht micromorpholoyg o fthe degradatin perfromed by the enzymes on the fibers was examined using elecron microscopy.The preferential site of attack and the diffusabiltiy of the enzymes in the fiber walls wer eevlauated.It appears that MnP and Lac produce typicla defibrillation patterns.In addition,Lac shows a patidcular ability to degrade lignin from the middle lamella.
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